For me, selling artifacts has been good.

If there are none of the same type I want to sell I'll put mine up for 1 - 3, sometimes 2- 5 and they will sell.
Blue artifacts, again if there are none currently up I can sell for 10+ plat.

I have sold 2 x Tidal Fangs for 10 & 15 plat.

Also, mats sell very well at least on Alsbeth Guardian side.

My team is sitting in the low - mid 40s as I haven't had much time to play other than my AH alt.